21000120011112 has 128 divisors (see below), whose sum is σ = 57713969617920. Its totient is φ = 6314868864000.

The previous prime is 21000120011083. The next prime is 21000120011113. The reversal of 21000120011112 is 21111002100012.

It is a super-2 number, since 2×21000120011112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21000120011113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17422437 + ... + 18588747.

It is an arithmetic number, because the mean of its divisors is an integer number (450890387640).

Almost surely, 2^{21000120011112} is an apocalyptic number.

21000120011112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000120011112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28856984808960).

21000120011112 is an abundant number, since it is smaller than the sum of its proper divisors (36713849606808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000120011112 is a wasteful number, since it uses less digits than its factorization.

21000120011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166855 (or 1166851 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21000120011112 its reverse (21111002100012), we get a palindrome (42111122111124).

The spelling of 21000120011112 in words is "twenty-one trillion, one hundred twenty million, eleven thousand, one hundred twelve".